deps: update dependencies for GORM, Viper, and SQLite support

- Add GORM v1.25.12 with MySQL and SQLite drivers
- Add Viper v1.19.0 for configuration management
- Add UUID package for GORM model IDs
- Update vendor directory with new dependencies
- Update Go module requirements and checksums

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

vendor/github.com/pelletier/go-toml/v2/unstable/doc.go

@@ -0,0 +1,3 @@
+// Package unstable provides APIs that do not meet the backward compatibility
+// guarantees yet.
+package unstable